Finding the Fourth Proportional to 1,036.72, 1,553.20 and 864.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036.72 : 1,553.20 = 864.48 : x
2. Step 2: Convert to fraction form
   1,036.72/1,553.20 = 864.48/x
3. Step 3: Cross multiply
   1,036.72x = 1,553.20 × 864.48
4. Step 4: Simplify right side
   1,036.72x = 1,342,710.34
5. Step 5: Solve for x
   x = 1,342,710.34/1,036.72
6. Step 6: Final answer
   x = 1,295.15